Ri4Power Rated peak withstand current Ipk Standard reference chapter 5.3.4 to IEC 61 439-1 The peak withstand current of the low-voltage switchgear With RiPower, this value may be adjusted by selecting the must be greater than or equal to the specified peak value different busbar systems to meet requirements. In this con- of the uninfluenced peak current that may flow through the nection, please also refer to page 44, Design of the busbar low-voltage switchgear. systems. Rated short-time withstand current Icw Standard reference chapter 5.3.5 to IEC 61 439-1 The rated short-time withstand current of the low-voltage With Ri4Power, this value may be adjusted by selecting the switchgear shall be equal to or higher than the prospective different busbar systems to meet requirements. By means rms value of the short-circuit current of the supply system of various measures, such as the use of busbar claws or to which the circuit is designed to be connected. When stabilisers, the short-circuit resistance may be additionally defining the rated short-time withstand current Icw, a period increased. In this connection, please also refer to page 44, of time must always be given. Generally speaking, the rated Design of the busbar systems. short-time withstand current Icw is given for a period of 1 second. Conditional rated short-circuit current Icc Standard reference chapter 5.3.6 to IEC 61 439-1 The rated short-circuit current of the low-voltage switchgear via the supply to the low-voltage system, but for a limited must be greater than or equal to the prospective root-mean- time via the initiation of a short-circuit protection device square value of the short-circuit current that may be fed in (fuse, air circuit-breaker etc.) Rated frequency fn Standard reference chapter 5.4 to IEC 61 439-1 The rated frequency of a circuit is given for the operating All Ri4Power components are designed for a nominal value condition. If circuits with different frequencies are used in of 50 Hz. Any uses that deviate from this should be agreed a low-voltage switchgear, separate values must be given with the Rittal Technical Support team. for each circuit. Pollution degree Standard reference chapter 7.1.3 to IEC 61 439-1 The pollution degree is a ratio indicating the influence of The Ri4Power system including all busbar and connection dust, gas, dirt, salt etc. on reducing dielectric strength and/or components is designed for pollution degree 3. Hence, surface resistance. The admissible creepage distances and the requirements of pollution degrees 1 and 2 are also met. minimum gap widths of the operating equipment are depend- ent on this value. 2 - 39 Rittal Technical System Catalogue/Power distribution
Technical System Catalogue Ri4Power
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